Problem:

The disabled snap packages are using space in your hard disk.

Solution:

To solve it, You can list and delete them!.

Step by step:

  1. Open a Terminal and list all the snap packages:

     snap list --all

  2. Remove a specific revision (“version”) snap package.

     $ sudo snap remove <snapname> --revision=<revision_number>

    Example:

         sudo snap remove okular --revision=172

  3. Finally, you can verify that the package was successfully removed.

     snap list --all

Source:

https://snapcraft.io/docs/get-started